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From Anglo-Norman enseurer, from Old French seur (sure).



ensure (third-person singular simple present ensures, present participle ensuring, simple past and past participle ensured)

  1. (transitive) To make a pledge to (someone); to promise, guarantee (someone of something); to assure. [14th-18th c.]
    • 1485, Thomas Malory, Le Morte d'Arthur, Book XVI:
      ‘Fayre knyght, for Goddis love, sle me nat, and I shall ensure the never to warre ayenste thy lady, but be allway towarde hir.’
  2. (intransitive) To make sure or certain of something (usually some future event or condition). [from 18th c.]
    I use an alarm clock to ensure that I get up on time.
    • 2013 August 10, Lexington, “Keeping the mighty honest”, The Economist, volume 408, number 8848: 
      British journalists shun complete respectability, feeling a duty to be ready to savage the mighty, or rummage through their bins. Elsewhere in Europe, government contracts and subsidies ensure that press barons will only defy the mighty so far.

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